silphium perfoliatum. yellow flowers of the cup plant.

flower plant yellow wildflower herb meadow produce prairie blossom field petal food nature shrub grass vegetable grassland silphium perfoliatum flowers cup close green closeup background bloom flower leaf flowers silage petal silphium energy plant meadow sunflower towering blossoms wildflowers papilio glaucus butterfly blossom agriculture nature summer yellow flora perfoliate farming field ecology herb close wild crop botanical blooming herbaceous flowering nectar alternative asteraceae biomass colorful butterflies garden